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Developed by Microsoft, Windows seven is a pc software system. Windows seven Development occurred as early as in the year 2006 under the codename "Blackcomb." Windows seven was released to manufacturing on the July twenty two, 2009, and generally in a period less than 3 years after its predecessor windows vista was released on the market on the October 22, 2009. Windows Server 2008 R2, a counterpart of Windows 7's server release was at a similar time.

Windows seven was primarily meant to be an incremental upgrade to the OS, aiming to address criticisms long-faced by its precursor, Windows vista (such as improvements on performance), without changing the compatibility with software and hardware system designed for vista. Whereas holding the same look to vista, 7's interface streamlining was done with the subsequent addition of a taskbar that had been redesigned to enable applications to be "pinned" thereto, and as well enable new window management features. A new "Action Center" interface was additionally added to provide an overview of system security and maintenance info too, and tweaks were made to the User Account control system to make it less intrusive. Windows 7 additionally shipped with updated versions of many applications stock for the user.

In contrast to vista, Windows seven was usually praised by critics, who considered the OS to be a significant improvement over its precursor owing to its increased performance, its more intuitive interface (with particular praise dedicated to the new taskbar), fewer User Account management popups, and alternative enhancements made across the platform. Windows seven was a significant success for Microsoft; even before its official release, pre-order sales for seven on the net distributor Amazon.com had surpassed the record set by Harry Potter and the Deathly In only six months, over one hundred million copies had been sold worldwide, increasing to 630 million licenses and over by July 2012, thus attaining a total market share of 50.06% as of May 2014 according to applications of the internet, making it the most widely used version of Windows.

Originally, in 2000 a version of Windows codenamed Blackcomb was planned as the successor to Windows XP and Windows Server 2003. Planned for Blackcomb were Major features, including a stress on searching and querying information and an advanced storage system named WinFS to modify situations such as those. However, announced for 2003 was a minor release, interim, codenamed "Longhorn," was, delaying the blackcomb event. As at the mid of 2003, though, longhorn had acquired a number of the features originally meant for Blackcomb. After 3 major viruses, the workman, Sober, and Sobig worms, exploited flaws in Windows operating systems within a short period of time in 2003, Microsoft modified its development priorities, putting a number of Longhorn's major development work on hold whereas developing new service packs for Windows XP and Windows Server 2003. Development of longhorn (Windows Vista) was additionally restarted, and therefore delayed, in Aug 2004. Cut from longhorn was a number of features. In early 2006, Blackcomb had to rename Vienna.